chore(fmod): add files from Chensne/DragonNest

2025-08-19 10:12:56 -04:00 · 2025-08-19 10:12:56 -04:00 · 50fb3c6b1c
commit 50fb3c6b1c
544 changed files with 315778 additions and 0 deletions
--- a/lib/neural_thx/Limiter.c
+++ b/lib/neural_thx/Limiter.c
@ -0,0 +1,110 @@
+//					        _____________
+//					      _________________
+//					    _____/~\___________/\_
+//					  ______/\_/\_________/\____
+//					 ______/\___/\_______/\______
+//					 _____/\_____/\_____/\_______
+//					 ____/\_______/\___/\________
+//					  __/\_________/\_/\________
+//					   /\___________/~\_______
+//					     ___________________
+//					        _____________
+//
+//***************************************************************************//
+//*																			*//
+//*  Project     : Neural Audio												*//
+//*  File        : Limiter.c												*//
+//*  Description : Limiter													*//
+//*  Author(s)   : Jeff Thompson											*//
+//*																			*//
+//*					Copyright (c) Neural Audio Corp. 2008					*//
+//*																			*//
+//***************************************************************************//
+#include "Neural_THX_Encoders.h"
+#include <stdlib.h>
+#include <math.h>
+#include <float.h>
+#include "fmod_types.h"
+
+//***************************************************************************//
+//*                           Limiter_INIT(...)                             *//
+//***************************************************************************//
+int Limiter_INIT(float * TempBuffer,
+				 Limiter_Struct * pPtr)
+{
+	pPtr->TempBuffer = TempBuffer;
+	PeakConverter_INIT(0.0f,0.0f,0.0f,0.0f,0,&pPtr->EnvSmoother);
+	return NRLSUR_OK;
+}
+
+//***************************************************************************//
+//*                             Compressor(...)                             *//
+//***************************************************************************//
+int Limiter(float * AudioIn,
+			float * AudioOut,
+			float MaxAudioValue,
+			float Knee,		//in dB referenced to zero dB
+			float Ceiling,	//in dB referenced to zero dB
+			float RiseTime,	//in msec
+			float FallTime,	//in msec
+			unsigned int Framesize,
+			unsigned int SampleRate,
+			Limiter_Struct * pPtr)
+{
+	int n;
+	float fTemp;
+
+	if(Knee > Ceiling) Knee = Ceiling;
+
+	CopyArray(AudioIn,pPtr->TempBuffer,Framesize);
+
+	//First normalize audio
+	if(MaxAudioValue < (float)FLT_EPSILON)
+		MaxAudioValue = (float)FLT_EPSILON;
+	fTemp = 1.0f / MaxAudioValue;
+	ScaleArray(pPtr->TempBuffer,fTemp,Framesize);
+
+	//First convert the audio to the dB domain
+	AbsValue(pPtr->TempBuffer,Framesize);
+	MinClip(pPtr->TempBuffer,(float)FLT_EPSILON,Framesize);
+	MaxClip(pPtr->TempBuffer,1.0f,Framesize);
+	FastLog10_ARRAY(pPtr->TempBuffer,pPtr->TempBuffer,Framesize);
+	ScaleArray(pPtr->TempBuffer,20.0f,Framesize);
+
+	//Smooth the envelope
+	PeakConverter(pPtr->TempBuffer,
+				  pPtr->TempBuffer,
+				  RiseTime,	//in msec
+				  FallTime,	//in msec
+				  -60.0f,
+				  0.0f,
+				  Framesize,
+				  SampleRate,
+				  &pPtr->EnvSmoother);
+
+	//Apply the knee and ceiling parameters
+	for(n = 0; n < (int)Framesize; n++){
+		fTemp = pPtr->TempBuffer[n];
+		pPtr->TempBuffer[n] = 0.0f;
+		if(fTemp > Knee){
+			pPtr->TempBuffer[n] = 0.5f * (Knee - fTemp);
+			fTemp = fTemp + pPtr->TempBuffer[n];
+		}
+		if(fTemp > Ceiling){
+			pPtr->TempBuffer[n] += Ceiling - fTemp;
+			fTemp = fTemp + pPtr->TempBuffer[n];
+		}
+	}
+
+	//Convert back to linear domain
+	MaxClip(pPtr->TempBuffer,0.0f,Framesize);
+	ScaleArray(pPtr->TempBuffer,0.05f,Framesize);
+	FastPow10_ARRAY(pPtr->TempBuffer,pPtr->TempBuffer,Framesize);
+
+	//Limit the audio signal
+	Multiply2(AudioIn,pPtr->TempBuffer,AudioOut,Framesize);
+	Ceiling = FMOD_POW(10.0f,0.05f*Ceiling) * MaxAudioValue;
+	SaturateArray(AudioOut,Ceiling,Framesize);
+	
+	return NRLSUR_OK;
+}